Pin hold-down mechanism



May29, 1951 K. T. DAVIS PIN HOLD DOWN MECHANISM Filed April 8, 1949 Ill lll llIIlll |||||L.| Ll

4 KENNETH T. DAVIS,

2/ M lk m wow,

Patented May 29, 1951 UNITED STATES,

PAT EN T OFFICE PIN "HOLDL-DOWN MECHANISM Kenneth T.IDa,vis', -:Co1umbus, Ohio, assignor to The Jeffrey Manufacturing Column-ma. corpoe :1

ration of Ohio Application-11111418, 1949, Serial N0. 86,265

6 Claims. ;.(Cl. -..162)1-- being set forth in thegappendedvclaims;r;

In the accompanying drawings-1x.

Fig. 1 is an. enlargeduplan: view. of=:.the.:.hold:.v down mechanism andpart of the-associatedpinss. supporting: and heating. mechanism;

Fig. 2 is-a sideaelevationalvview:of the:..device;.

of Fig. 1, also showingqa partnofstheirecipro-:.- cating die block andiassociatededie .of thejheadingl machine with; which theiholdzvdown; mecharp nism is associated;.

Fig. 3 is a front elevational..-viewiof thedeviceuz of Figs. 1 and2;.and;

Fig.4 is a view: Slml1a.1 -=t0',Flg.nr2, .With part -:1. brokenaway, showingeparticularly the. opera-1 tion of the hold down mechanism;- in ;coope ra.-.-.:

tion with the pin just priornto the. pin s being-;.

received by the. lowerdieof .thepin. heading machine;

The pin hold downcmechanism. hereinv dis-v closed and claimed is also. disclosed: in. the appli- 2 1 is not shown'inFig'sld and 3 of the drawings, in the interest of clearness;

The left-hand" ends of the pins, as viewed in Fig. 1, project beyond'the plate I02 and pass 5 'ilnder the influence of the coils 105- ofa high frequency induction heating unit which may be supplied with 'high' frequency current from any desired source,such as a TOCCO JR. unit.

Adjacent its forward end thes-plate "12 car- 'ries a pivoted feedarm -lflt' which' has an upwardly extending head- 101 "which is positionedbelow the lowermost pin9l' and works between the lowerend of the supporting plate IEJZ and .a stop bar I08 whichis carried bya bracket which forms-inefie'ct an extension of the pin supporting plate "I 02.

Asclearly illustratedvinuFig. 2 ofthe drawings-"when the'rdieblockcfifiLand die 89? are in their in or pin= clampingposition the head "I 01 will rest beneath the lowermost pin 91: Whenther'die block c86is removed to :its fout or pin receiving-positiomas. illustratediin Fig. 4 ofthe drawings; thecam 2 surface l09z-on'the" die :block I 86? cooperates. witht'ia roller,='2l-lfl:carried by -the -=feed arm I06 to swing said feed arm about its pivot; thus movinguthethead [Mi-upwardly to pushthepinoversthe'stop bar I08 and allowit to roll into the pin-groove-Qflrof-the lower clamp ingLdierBQZ" cation of-FredJ. Wright, Ser-ial.No.-'71,465,. filed. 3055 It has =beenfound'inpracticevthat for some January. 18, 1949, entitled =Hot Pin; Heading... Machine. Said mechanism is designedrparticu-rw larly for use in connectionwith the .pin heading machine disclosed in detailandsclaimedin said pins, dependingupon-theirusize and/ormaterialpthe" pin-:is not--alwaysp accurately received in. the slotr 90: To overcomevthis difficulty, the pinzhold 'down mechanism r l l I; -as-disclosed in Wright application.-= Certain parts of the.-pin ;.Fi2sznlt0 4 oifithe'zdrawings; was-devised.-

heading machine. are .alsodisclosedinthe instant application.-

As disclosed. in complete detailzinsaidswright.r application, the pin heading..machine.. includes die block 86 carries a removable lower clamp. ing die 89 providedwitha transverse ,semi-m 1 cylindrical pin receiving. .groove. 90 adapted. to receive a pin 9|. The ,.pins.9l.rare. fed succese;

sloping supporting plate vHi2. overwhich. .they-, slide by friction under -the control-.of .mecha-= nisrn hereinafter. described;

As best seen. byzreferenceto Fig. 1. of the draw:

ried by the supporting plate .1 t 2 K which guides the pins 91' as, they slide.or. .travel.by gravity., down the -inclined=-p1ate.402o -An. -adjustablehold down-barlM (:seeFigs. 2 and4.)- is DI'QVidBdJ...

Pin hold down mechanism Ill includesa generally-horizontal :body plate or-irame1-l l to which is connected ran upwardly inclined -1nte-- grally formed 'bracket :and pin guide plate I I3 a horizontally; reciprocating .die .block- 86. .Said =1 1a, ViI-1g@a. wing-1i It provided with an elongated slot-adapted to be releasablyconnected to the- Stephan-J08 to supportthe 'plate- H2, 1 Mat one 1 end; vr Adjacent=the other end there -is a generally Y verticalguideplate I I 5 which hasan'- outwardly sivelyto the groove 90 bymeansofa downwardly... d top and, hich is rigidly attached-to the left-hand end of .the plates H2 and H 3, as viewed in-Fig of the drawings. s

Guideplate l lfiacts: as :a guide and abutment plate for the leftehandzorheatedends ofthe pins ings: there is amadiustable;'gllid(p1a1te, I- 9b as 'y-iewedinFigii, guiding said .pinsastheyy are ejected by thehead; ling-and-,rolledaover the top. of .the..stop.bar. l08.... The guide plate ,I I5 is punchedsto receivea pivotstudJ I6 Which has a double .function of..attaching..the left-hand end to hold the pins flhomsaid :plate..l02;- This .hanflgm; of the pin hold down mechanism ,1 i i ,to-the stop I bar I08 and providing a pivot to support a bell crank actuator III. The actuator III has a downwardly extending curved. arm which is adapted to be contacted by a pin IIB carried by the die block 86, as the die block 86 moves toward its outer or retracted position.

In Fig. 4 of the drawings the various parts are illustrated in which feed arm I06 has been actuated by cam I09 to push a in 9| over the stop bar I08, which pin 9| was then guided by the guide plate II3 as it rolled over the curved lowermost nose of the stop bar I08 and fell onto a flat surface on the top of the die block 86 or die 89.

The parts are so timed that substantially at the instant the pin drops on top of the die block 86, or of the die 89 which constitutes a continuation thereof, the bell crank III will have been sufficiently moved from its inactive position, as illustrated in Fig. 2, to its active position, as illustrated in Fig. 4, so as to stretch a helical spring II9 extending between the upper arm of the crank II! and a pivoted lever I20 suificient to swing the lever I20 from its inactiv position of Fig. 2 to its active position of Fig. 4.

The lever I20 is rigidly attached to a pivot rod I 2| pivotally mounted on the plate I I2 and carrying a rigidly attached wing, butterfly or flapper I22. The flapper I 22, when inactive, is positioned within an opening in the plate H3 and in effect constitutes a part of it. The flapper can swing from the opening in plate I I3, that is,

from its inactive position as seen in Fig. 2 to its active position as seen in Fig. 4.

Thus when a pin 9I has been dropped onto the die block 86 or the die 89, as above mentioned, spring 9 will be tensioned sufficiently so as to swing the flapper I22 down over the pin 9Iand hold it down against the upper surface of said die block 86 or die 89. The flapper I22 is biased to its inactive position by a helical spring I23 which surrounds the pivot rod I2I, being attached to the hub of the lever I20 at one end, and to a stationary journal box on the plate I I at the other end.

The two springs H9 and I23 cooperate so that a snap action in both directions is imparted to the flapper I22. That is, as bell crank II! is swung rearwardly, or to the left, as viewed in Figs. 2 and 4, spring III] will be expanded until it has adequate force to overcome spring I23. Flapper I 22 will then snap from its inactive position of Fig. 2 to its active position of Fig. 4. Any further rearward movement of the die block 86 will merely further expand spring I I9 without significant effect.

Fig. 4 shows the relation of the parts just prior to the die block 86 reaching its rearmost or outer position and under these conditions the pinv 9I thereon will be rolling over the surface of the die 89, being guided by the flapper I22 and by the plate I I5 adjacent one end thereof. The other end is guided by an adjustable guide block I24 which is adjustably mounted on the horizontal plate II2.

When the die block 86 reaches its rearmost position a pin 9| will have been rolled into the groove 90 and as the die block 86 moves forwardly the parts will ultimately assume the positions illustrated in Fig. 2. with a pin 9! carried in the die 89, as illustrated in said Fig. 2. There 18 also a hold down spring tongue I25 carried by the plate II 2 and extending forwardly therefrom to hold the pin 9| in the groove 90 afte s p1n passes from under the plate I I2.

' lo said die block to feed said pins one at a time Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and applicant therefore wishes not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of the invention, what it is desired to secure by Letters Patent of the United States is:

1. In combination, pin feeding mechanism including a bar over which pins roll onto a horizontally reciprocating die block having a flat top pin supporting surface leading to a pin receiving groove, a pivoted flapper swingable against the top of a pin after it rolls over said bar onto said flat top surface, spring tensioning means operable by movement of said die block in one direction to swing said flapper-from one position against said pin after it has rolled over said bar as aforesaid and operable by movement of said die block in the other direction to swing said flapper back to its first position whereby another pin can roll over said bar onto the pin supporting surface, and guide means for holding said pin on said flat top surface until it is rolled into said groove.

2. In combination, pin feeding mechanism including a bar over which pins roll onto a horizontally reciprocating die block having a flat top pin supporting surface, a pivoted flapper swingable against the topof a pin after it rolls over said bar onto said flat top surface, and means operable by movement of said die block in one direction to swing said flapper from one position against said pin after it has rolled over said bar as aforesaid and operable by movement of said die block in the other direction to swing said flapper back to its first position whereby another pin can roll over said bar onto the pinsupporting surface of said die block.

3. In combination, pin feeding mechanism including a bar over which pins roll onto the top fiat surface of a horizontally reciprocating die block, means including a pin guiding plate extendin upwardly and over said block, a pivoted flapper on said plate spring biased to an upwardly inclined position and spaced from said bar to admit a pin between it and the bar as said pin rolls over the bar top, and means operable by rearwardly reciprocating movement of said die block to swing said flapper downwardly on a pin and hold the pin on said flat surface, said means including a resilient connection and a pivoted arm operated by said die block.

4. In combination, pin feeding mechanism including a bar over which pins roll onto the top flat surface of a horizontally reciprocating die block, means including a pin guiding plate extending upwardly and over said block, a pivoted flapper on said plate spring biased to an upwardly inclined position and spaced from said bar to admit a pin between it and the bar as said pin rolls over the bar top, and means operable by rearwardly reciprocating movement of said die block to swing said flapper downwardly on a pin and hold the pin on said flat surface.

5. In combination, pin feeding mechanism including a plate over which pins travel, a bar at one end of said plate over which pins roll one at a time, a horizontally reciprocating die block below said bar having a surface adapted to receive each pin afterit has rolled over said bar, said surface leading to a pin receiving groove in said die block, a feed arm adapted to be moved by over said bar, a pivoted flapper swingable against said pin after it has rolled over said bar and onto said surface, spring tensioning means operable by movement of said die block in one direction to move said flapper from one position against said pin after it has rolled over said bar as aforesaid and operable by movement of said die block in the other direction to swing said flapper to its first position whereby another pin can roll over said bar onto said die block surface, and guide means for holding said pin on said flat top surface until it is rolled into said groove.

6. In combination, pin feeding mechanism including a plate over which pins travel, a bar at one end of said plate over which pins roll one at a time, a horizontally reciprocating die block below said bar having a surface adapted to receive each pin after it has rolled over said bar, a feed arm adpted to be moved by said die block to feed said pins one at a time over said bar, a pivoted flapper s'wingable against said pin after it has REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 549,190 Fox Nov. 5, 1895 1,585,414 Pritchard May 18, 1926 20 2,271,844 Olson Feb. 3, 1942 

